macOS Tahoe 26.3.1 update will “upgrade” your M5’s CPU to new “super” cores
Summary
macOS Tahoe 26.3.1 renames the M5 high-performance cores to 'super' cores, retroactively applying the change to existing M5 Macs. The update is primarily a naming change with no expected performance delta, and it enables compatibility with Apple's Studio Displays. Older Macs (M1–M4) keep their original core labels, and not all Macs support the Studio Display XDR at full specs.